The total amount he would have at 69 is $343,347.81.
The formula that can be used to determine the future value of the deferred annuity is:
Future value = annuity factor x monthly deposit
Annuity factor = {[(1+r)^n] - 1} / r
Where:
Amount he would save every 6 months:
Future value : 900 x {[(1.0275^90) - 1] / 0.275}= $343,347.81
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